I was always intrigued by the line from the song "Ya Got Trouble" from the musical "The Music Man" that went like this: "Well the next thing you know your son is playing for money in a pinchback suit..."

I always assumed that was "pinchback" connoted a style of tailoring, perhaps with pleats on the back of the jacket. Maybe the word, however, was actually "pinchbeck," as in a fabric that was some sort of counterfeit of a more expensive fabric.